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Effect of oxy-fuel combustion on flame characteristics of low calorific value coal gases in a small burner and combustor

机译：小型燃烧器和燃烧器中含氧燃料燃烧对低热值煤气的火焰特性的影响

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摘要

Currently, using oxygen instead of air in a combustion process is being widely discussed as an option to reduce fuel consumption and utilization of oxygen is expected to improve the thermal efficiency and combustion performances. The main goal of this study is to determine the combustion behaviors of low calorific value coal gases under oxy-fuel combustion conditions and to compare with the results of air-fuel combustion conditions in the existing burner and the combustor. The coal-derived low calorific value coal gases (syngases) have been properly oxy-combusted using the existing burner within the present study. Temperature and emission values have been experimentally measured and investigated on different axial and radial positions by using thermocouples and a flue gas analyzer throughout the combustion chamber. All experiments have been performed under a thermal power of 10 kW and an excess oxygen coefficient of lambda = 1.2 combustion conditions for both turbulator distances of 7 cm and 2 cm. The burner walls were overheated due to using of pure oxygen instead of air during combustion when the turbulator position of the burner was further to the burner exit (7 cm). Because of that, the turbulator position of the burner has also been changed as a small modification to alleviate overheating of the burner walls and hence, it was drawn near to the burner exit (2 cm). Therefore, it can be said that the burner either can be used with modification or the burner material should be changed to be withstood higher temperature levels. It is consequently concluded that the flame that has emerged under combustion condition with 2 cm of the turbulator distance is wider and smoother than that of the flame showing up under combustion condition with 7 cm of the turbulator distance. CO, CO2 and NOX emissions have also been determined on different axial and radial positions. According to the measurements, it has been demonstrated that CO2 and NOX decrease while CO increase on the axial measurements as the turbulator distance is draw near to the burner exit. When the oxy-fuel combustion results are compared with the air-fuel combustion results, it can be concluded that the oxy-fuel combustion performances of the coal-derived syngases are better than that of the air-fuel combustion, which corresponds to an increment of about 22% in their flame temperatures. However, it has been obtained that oxy-fuel NOX values are not lower than that of the air-fuel values due to the higher flame temperatures. It has been revealed that oxy-fuel CO emission values are lower and oxy-fuel CO2 emission values are higher (approximately 30%) than values of the air-fuel combustion due to the absence of nitrogen in the oxidizer.
机译：当前，在燃烧过程中使用氧气代替空气已被广泛讨论作为减少燃料消耗的选择，并且期望利用氧气来提高热效率和燃烧性能。这项研究的主要目的是确定低热值煤气在含氧燃料燃烧条件下的燃烧性能，并与现有燃烧器和燃烧器中的空燃条件进行比较。在本研究中，已使用现有的燃烧器对源自煤的低热值煤气（合成气）进行了适当的氧气燃烧。通过在整个燃烧室中使用热电偶和烟气分析仪，已经在不同的轴向和径向位置上对温度和排放值进行了实验测量和研究。所有的实验都是在10 kW的火力和7 cm和2 cm的两个湍流器距离的过剩氧系数λ= 1.2燃烧条件下进行的。当燃烧器的湍流器位置进一步到达燃烧器出口（7厘米）时，由于在燃烧过程中使用纯氧气代替空气，导致燃烧器壁过热。因此，燃烧器的湍流器位置也作了较小的修改，以减轻燃烧器壁的过热，因此被拉到靠近燃烧器出口（2厘米）的位置。因此，可以说燃烧器可以改型使用，或者应该改变燃烧器材料以承受更高的温度水平。因此得出的结论是，在燃烧条件下，距离为2 cm的燃烧器出现的火焰比在燃烧条件下，距离为7 cm的火焰更宽，更光滑。还已在不同的轴向和径向位置确定了CO，CO2和NOX的排放量。根据测量结果，在轴向测量中，随着扰流器距离接近燃烧器出口，CO2和NOX减少，而CO增加。将含氧燃料的燃烧结果与空气燃料的燃烧结果进行比较，可以得出结论，煤制合成气的含氧燃料的燃烧性能要优于空燃的燃烧性能，这相当于增加了一个增量。其火焰温度约为22％。但是，由于较高的火焰温度，已经获得氧燃料NOX值不低于空气燃料值。已经发现，由于氧化剂中不存在氮，所以氧-燃料CO的排放值较低，而氧-燃料CO2的排放值较高（约30％）。

著录项

  • 来源
    《Fuel》 |2018年第15期|350-364|共15页
  • 作者

    Ilbas Mustafa; Bektas Abdulkadir; Karyeyen Serhat;

  • 作者单位

    Gazi Univ, Technol Fac, Dept Energy Syst Engn, TR-06500 Ankara, Turkey;

    Gazi Univ, Grad Sch Nat & Appl Sci, TR-06500 Ankara, Turkey;

    Gazi Univ, Technol Fac, Dept Energy Syst Engn, TR-06500 Ankara, Turkey;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Oxy-fuel combustion; Coal gases; Burner; Modification;

    机译：含氧燃料燃烧;煤气;燃烧器;改造;

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